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• W2000440095 abstract "The fast developing field of molecule-based magnets involving organic and coordination chemistry provides the physicist with a multitude of novel compounds of unprecedented structure. The magnetic structure of ${text{Cu}}_{4}(text{tetren}){[text{W}{(text{CN})}_{8}]}_{4}$ $(mathbf{1})$ was shown to consist of weakly coupled double layers. By contrast, in the structurally similar compound ${text{Cu}}_{2+x}{text{Cu}}_{4}{[text{W}{(text{CN})}_{8}]}_{4}$ $(mathbf{2})$ the free spaces between the double layers are filled with paramagnetic copper(II) ions leading to a unique magnetic network. Both compounds exhibit the transition to a magnetically ordered phase at ${T}_{c}ensuremath{approx}33text{ }text{K}$ and ${T}_{c}ensuremath{approx}40text{ }text{K}$, respectively. The critical behavior of $mathbf{1}$ and $mathbf{2}$ is investigated using complementary methods: ac magnetometry, relaxation calorimetry, and muon spin-rotation spectroscopy. Apart from $ensuremath{alpha}$, $ensuremath{beta}$, and $ensuremath{gamma}$, critical exponents $ensuremath{kappa}$ and ${ensuremath{kappa}}^{ensuremath{'}}$ describing the combined scaling of excess entropy and order parameter are determined for both compounds. This type of scaling is verified for $mathbf{1}$, the system revealing the signatures of the Berezinskii-Kosterlitz-Thouless transition. For $mathbf{2}$ their values imply that the system is close to the universality class of the three-dimensional Heisenberg model. The relatively small value of exponent $ensuremath{gamma}=1.05$ for $mathbf{2}$ indicates the presence of noncollinearity in the spin arrangement. Exponents $ensuremath{kappa}$ and ${ensuremath{kappa}}^{ensuremath{'}}$ for $mathbf{2}$ are also found consistent with noncollinear models. The shift of the heat-capacity anomaly toward higher temperatures with increasing applied field indicates the presence of ferromagnetic interactions in $mathbf{2}$." @default.
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• W2000440095 date "2010-09-29" @default.
• W2000440095 modified "2023-10-18" @default.
• W2000440095 title "Critical behavior of two molecular magnets probed by complementary experiments" @default.
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• W2000440095 doi "https://doi.org/10.1103/physrevb.82.094446" @default.
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